In this series, we are going to show the EcmaScript features from 2015 to today.
- ES2015 aka ES6
- ES2016 aka ES7
- ES2017 aka ES8
- ES2018 aka ES9
- ES2019 aka ES10
- ES2020 aka ES11
- ES2021 aka ES12
ES2016 aka ES7 is the version of ECMAScript corresponding to the year 2016. This version does not include as many new features as those that appeared in ES6 (2015). However, some useful features have been incorporated.
This article introduces the features provided by ES2016 in easy code examples. In this way, you can quickly understand the new features without the need for a complex explanation.
➡️️ Exponentiation operator
includes() method determines whether an array includes a certain value among its entries, returning true or false as appropriate.
Array.prototype.includes return a Boolean which is true if the value valueToFind is found within the array.
Values of zero are all considered to be equal, regardless of sign, but false is not considered to be the same as 0.
const fruits = [🍐, 🥑, 🍇] fruits.includes(🥑) // true fruits.includes(🍉) // false fruits.includes(🍇, 3) // false fruits.includes(🍇, -1) // true fruits.includes(NaN) // true
If fromIndex is greater than or equal to the length of the array, false is returned. The array will not be searched.
const fruits = [🍐, 🥑, 🍇] fruits.includes(🍇, 3) // false fruits.includes(🍇, 100) // false
If fromIndex is negative, the computed index is calculated to be used as a position in the array at which to begin searching for valueToFind. If the computed index is less or equal than
-1 * arr.length, the entire array will be searched.
const fruits = [🍐, 🥑, 🍇] fruits.includes(🍐, -100) // true fruits.includes(🥑, -100) // true fruits.includes(🍇, -100) // true fruits.includes(🍐, -2) // false // array length is 3 // fromIndex is -100 // computed index is 3 + (-100) = -97
The exponential operator (**) is an infix operator for exponentiation.
produces the same result as
x ** y
Although many of these features may not be essential for the development of your Web application, they are giving possibilities that could be achieved before with tricks or a lot of verbosity.
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